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| Name | Features | File Type | Download | Metadata |
|---|---|---|---|---|
| Centers of Population by State, 1950 | points | shapefile | popctr_state1950.zip | XML |
| Centers of Population by State, 1960 | points | shapefile | popctr_state1960.zip | XML |
| Centers of Population by State, 1970 | points | shapefile | popctr_state1970.zip | XML |
| Centers of Population by County, 1970 | points | shapefile | coming soon | coming soon |
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